Peek stage: Columns category
True by default and prints all the input columns.
Peek all input columns
True by default and prints all the input columns. Set to False to specify that only selected columns will be printed and specify these columns using the Input Column to Peek property.
Input column to peek
If you have set Peek All Input Columns to False, use this property to specify a column to be printed. Repeat the property to specify multiple columns.